This document provides definitions and explanations of different types of demand. It discusses the differences between short-run and long-run demand, derived and autonomous demand, producer's and consumer's goods, durable and non-durable goods, and industry and company demand. Short-run demand refers to existing demand with immediate price or income changes, while long-run allows market adjustments. Derived demand arises from another good's demand, while autonomous demand comes from factors like income changes. Producer's goods are production inputs, while consumer's goods are final products. Durable goods can be used over time, while non-durable goods meet current needs only. Industry demand is total for a sector, while company demand refers to a specific firm.